'use strict';

// JS 宿主环境有哪几种？  1. 浏览器    2. node

// vue.config.js 中的 js 代码是在哪个宿主环境运行的？
// 是在 node 环境下运行的，因为 vuecli 是基于 webpack， webpack 又是基于 node

// process.env 是 node 全局变量 global 下的属性，所以能直接使用

// const HtmlWebpackExternalsPlugin = require('html-webpack-externals-plugin')

const path = require('path');
const defaultSettings = require('./src/settings.js');

function resolve(dir) {
  return path.join(__dirname, dir);
}

const name = defaultSettings.title || 'vue Admin Template'; // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 9528; // dev port

// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  // lintOnSave: process.env.NODE_ENV === "development",
  lintOnSave: false,
  productionSourceMap: false,
  devServer: {
    port: port,
    open: false, // 是否启动服务后，使用默认浏览器自动打开网站
    overlay: {
      warnings: false,
      errors: true,
    },
    proxy: {
      '^/api': {
        // target: 'http://localhost:3000',
        // target: 'http://ihrm.itheima.net',
        target: 'http://hrm.itheima.net', // 备用的
        changeOrigin: true,
        pathRewrite: {
          '^/api': '/prod-api',
        },
      },
    },
  },
  // 原始的 webpack 配置（会将 VueCLI 默认的配置 和 你自定义的配置 进行合并）
  // （推荐用这个）
  //   如果你现在会 webpack，那可以无缝衔接
  //   在新增配置时，用这个
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src'),
      },
    },
    plugins:
      process.env.NODE_ENV === 'production'
        ? [
            new (require('html-webpack-externals-plugin'))({
              externals: [
                {
                  module: 'vue',
                  entry: 'https://unpkg.com/vue@2.6.10/dist/vue.min.js',
                  global: 'Vue',
                },
                {
                  module: 'element-ui',
                  entry: [
                    'https://unpkg.com/element-ui@2.13.2/lib/index.js',
                    'https://unpkg.com/element-ui@2.13.2/lib/theme-chalk/index.css',
                  ],
                  global: 'ELEMENT',
                },
                {
                  module: 'xlsx',
                  entry: 'https://unpkg.com/xlsx@0.16.8/dist/xlsx.min.js',
                  global: 'XLSX',
                },
              ],
            }),
            new (require('uglifyjs-webpack-plugin'))({
              uglifyOptions: {
                compress: {
                  drop_console: true,
                },
              },
              sourceMap: true,
              parallel: true,
            }),
          ]
        : [],
    devtool: 'source-map', // 报错时，能看到源代码位置，不然打包后的代码找不报错的位置
  },
  // 基于函数链式调用API的配置方式
  // （不太推荐用这个）
  //      1. 有学习负担（要学新的 API），我们本来学习原生的 webpack 就已经很费劲了，好不容易记住原生的 webpack 配置
  //      2. 建议在需要修改 VueCLI 默认配置时 可以用这个
  chainWebpack(config) {
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial',
      },
    ]);

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch');

    // set svg-sprite-loader
    config.module.rule('svg').exclude.add(resolve('src/icons')).end();
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]',
      })
      .end();

    config.when(process.env.NODE_ENV !== 'development', config => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/,
          },
        ])
        .end();
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial', // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/, // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true,
          },
        },
      });
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single');
    });
  },
};
